# Which of the following configuration is correct for iron?a 1s2 2s2

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Krypton has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 (atomic number 36)1s2 meansorbital =1orbital type = snumber of electrons occupiying the orbital = 2if you count the number of electrons you will count 361s2 -> 22s2 -> 22p6 -> 63s2 -> 23p6 -> 64s2 -> 23d10 -> 104p6 -> 6————………..36if there is 36 electrons there is also 36 protons which denotes the atomic number 36, if you look at the periodic table element 36 is Krypton.Source(s): got corrected from a typokrypton: while you read this, have a periodic table handy. The first numbers in each set of 3 figures correspond khổng lồ the rows on the table. Number one starts with H và ends with He, 2 starts with Li and ends in Ne, 3 starts with Na and ends with Ar và so forth. The letters refer lớn orbitals surrounding the nucleus of the atom. Without getting into too much detail, the first 2 columns of the periodic table are the s orbital (H lớn Fr và Be khổng lồ Ra). Helium is also considered part of the s orbital so for the purpose of writing atomic formulas, you could put He on đứng top of Be (next to H) on the table. The last six columns of the table are the p. Orbitals (again, starting with B, C, N, O, F, & Ne all the way down. In the middle (the transition elements is the d orbital. Finally, the numbers on the kết thúc of “code” (2, 2, 6, 2, 6, 2, 10, 6) are the numbers of electrons in that orbital (identified by the letters). You are essentially counting valence electrons in each atom thereby identifying its atomic formula. Now look at your formula for Krypton. 1s2 means this element has has 2 electrons in the s orbital of the FIRST row so 1s2 would be He. But you have more… add 2s2 to 1s2 is lượt thích adding 2 electrons to lớn the s orbital of the SECOND row so 1s2 2s2 would be Be. Notice that 2 + 2 = 4 và that’s the number for Be. Krypton is identified by counting all the electrons on the table that precede it. So a shortcut khổng lồ figuring this all out would be to địa chỉ cửa hàng all the numbers after the letters to lớn get the total atomic number và there’s your element. 2 + 2 + 6 + 2 + 6 + 2 + 10 + 6 = 36. Krypton!!This Site Might Help You.

RE:what is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 ? và how did you figure it out?For the best answers, search on this site https://shorturl.im/avWHlOK the only element with no pair elections is hydrogen OK Sr has 2 valance e- so the Lewis dot structure is: ∙ Sr ∙ the two electrons are unpaired so there are 2 unpaired e- unpaired e- = valance e- if the number of valance e- is 41s 2 2s 2 2p 6Answer 6well its a p block element, go across the first row of transition metals, (Sc, Ti, Cu, fe etc), has 6 electrons in p. Subshells, so is a noble gas… am i helping to lớn jog your memory?Answer 7what is 1s2.2s2

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